Design of a Long Linear Helical Subarray for High-Power Cylindrical Conformal Array Antenna

A Ku -band long linear helical subarray (LLHS) for a high -power cylindrical conformal array antenna has been developed. The LLHS consists of 80 helical antennas can be used to constitute conformal array of cylindrical surface. Through the research on the embedded probe structure, the adjustment of the coupling ability of different types of unit probes, the sealing method of the whole feeding, the problems of large feed reflection, and the uneven coupling amount of the unit probe in the rectangular waveguide system are solved, and the LLHS which can be used in the high -power conformal array is realized. The LLHS which is 52.35 lambda length can obtain 25.2 dB gain, 2.31 dB axis ratio, 90% aperture efficiency, -15 . 65 dB reflection at 12.5 GHz, and the reflection is lower than -14 dB during 12-13 dB. In addition, it could handle a pulse power of 166 MW under vacuum condition.